#screen {
    width: 400px;
    height: 200px;
    font-size: 20px;
    background-color: grey;
    color: white;
    border-radius: 10px;
    text-align: center;
    line-height: 100px;

}
#match_button {
    width: 400px;
    height: 50px;
    font-size: 20px;
    color: white;
    background-color: orange;
    border: none;
    outline: none; /* 移除元素在获得焦点时的轮廓线 */
    border-radius: 10px;
    text-align: center;
    line-height: 50px;
    margin-top: 10px;
}
#match_button:active {
    background-color: grey;
}